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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
-2/u-6 = 7 // - 7
-2/u-7-6 = 0
-2*u^-1 = 13 // : -2
u^-1 = -13/2
-1 < 0
1/(u^1) = -13/2 // * u^1
1 = -13/2*u^1 // : -13/2
-2/13 = u^1
u = -2/13
u = -2/13
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